Standard C++ Library Class Reference

Example
//
// negator.cpp
//
#include<functional>
#include<algorithm>
#include <iostream.h>
//Create a new predicate from unary_function
template<class Arg>
class is_odd : public unary_function<Arg, bool>
{
public:
bool operator()(const Arg& arg1) const
{
return (arg1 % 2 ? true : false);
}
};
int main()
{
less<int> less_func;
// Use not2 on less
cout << (less_func(1,4) ? "TRUE" : "FALSE") << endl;
cout << (less_func(4,1) ? "TRUE" : "FALSE") << endl;
cout << (not2(less<int>())(1,4) ? "TRUE" : "FALSE")
<< endl;
cout << (not2(less<int>())(4,1) ? "TRUE" : "FALSE")
<< endl;
//Create an instance of our predicate
is_odd<int> odd;
// Use not1 on our user defined predicate
cout << (odd(1) ? "TRUE" : "FALSE") << endl;
cout << (odd(4) ? "TRUE" : "FALSE") << endl;
cout << (not1(odd)(1) ? "TRUE" : "FALSE") << endl;
cout << (not1(odd)(4) ? "TRUE" : "FALSE") << endl;
return 0;
}
Output :
TRUE
FALSE
FALSE
TRUE
TRUE
FALSE
FALSE
TRUE